243142301221 has 2 divisors, whose sum is σ = 243142301222. Its totient is φ = 243142301220.

The previous prime is 243142301183. The next prime is 243142301249. The reversal of 243142301221 is 122103241342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238645928196 + 4496373025 = 488514^2 + 67055^2 .

It is a cyclic number.

It is not a de Polignac number, because 243142301221 - 2²³ = 243133912613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243142331221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121571150610 + 121571150611.

It is an arithmetic number, because the mean of its divisors is an integer number (121571150611).

Almost surely, 2^243142301221 is an apocalyptic number.

It is an amenable number.

243142301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243142301221 is an equidigital number, since it uses as much as digits as its factorization.

243142301221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243142301221 its reverse (122103241342), we get a palindrome (365245542563).

The spelling of 243142301221 in words is "two hundred forty-three billion, one hundred forty-two million, three hundred one thousand, two hundred twenty-one".